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Improved Phebus laser performances required for precision laser–target experiments

Published online by Cambridge University Press:  15 October 2009

G. Thiell ,
R. Bailly-Salins ,
J.L. Bruneau ,
G. Coulaud ,
P. Estraillier ,
C. Gouedard ,
H. Graillot ,
J.P. Marret ,
A. Queffelec  and
J. P. Thebault
G. Thiell
Affiliation:
Commissariat à l'Energie Atomique, Limeil-Valenton, 94195 Villeneuve Saint Georges Cedex, France
R. Bailly-Salins
Affiliation:
Commissariat à l'Energie Atomique, Limeil-Valenton, 94195 Villeneuve Saint Georges Cedex, France
J.L. Bruneau
Affiliation:
Commissariat à l'Energie Atomique, Limeil-Valenton, 94195 Villeneuve Saint Georges Cedex, France
G. Coulaud
Affiliation:
Commissariat à l'Energie Atomique, Limeil-Valenton, 94195 Villeneuve Saint Georges Cedex, France
P. Estraillier
Affiliation:
Commissariat à l'Energie Atomique, Limeil-Valenton, 94195 Villeneuve Saint Georges Cedex, France
C. Gouedard
Affiliation:
Commissariat à l'Energie Atomique, Limeil-Valenton, 94195 Villeneuve Saint Georges Cedex, France
H. Graillot
Affiliation:
Commissariat à l'Energie Atomique, Limeil-Valenton, 94195 Villeneuve Saint Georges Cedex, France
J.P. Marret
Affiliation:
Commissariat à l'Energie Atomique, Limeil-Valenton, 94195 Villeneuve Saint Georges Cedex, France
A. Queffelec
Affiliation:
Commissariat à l'Energie Atomique, Limeil-Valenton, 94195 Villeneuve Saint Georges Cedex, France
J. P. Thebault
Affiliation:
Commissariat à l'Energie Atomique, Limeil-Valenton, 94195 Villeneuve Saint Georges Cedex, France
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Abstract

The Precision Phebus program, started in 1993, emphasizes a series of laser and target experiment objectives on the two-beam Phebus Nd-phosphate glass laser. Recently, three major objectives that are also very important issues for megajoule-class lasers have been met: First, the balance of the incident beam-to-beam 3ω power is shown to be in the range from 5 to 12% for 3-ns, 3ω-shaped pulses of reproducible high-energy shots; second, the smoothing uniformity of the laser energy deposited on the target, that is, the contrast of the spatial beam modulations, can be kept lower than 5%; and, finally, the tight control of the beam targeting leads to a pointing precision of less than 10 μrd on the target at the target chamber center (TCC) and of 80 μrd on X-ray sources located up to 3 cm from the TCC to improve the space- and time-resolved X-ray shadowgraphy techniques performed for target physics experiments such as implosion and hydrodynamical instability studies.

Type
Research Article
Information
Laser and Particle Beams , Volume 16 , Issue 2 , June 1998 , pp. 253 - 265
Copyright
Copyright © Cambridge University Press 1998

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References

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